Rotary pump or engine.



J. A. SVENSSON.

ROTARY PUMP 0R ENGINE.

APPLICATION FILED SEPT-12,1911- 1,297,749. Patented Mar. 18,1919.

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.' STATES PATENT OFFICE.

JOHAN ALBERT SVENSSON, OF STOCKHOLM, SWEDEN, ASSIGN'OR, BY MESNEASSIGN-,

MEN'TS, T LUDWIGSBERGS VERKSTADS .AKTIEBOLAG, 0F STOCKHOLM, SWEDEN".

T 0 all whom it may concern: 7

Be it known that I,'J0HAN ALBERT SVENS- soN, a subject of the King ofSweden, and resident of Hornsgatan 66 Stockholm, in the Kingdom ofSweden, have'inv'ented certain new and useful Improvements in R0- taryPumps or Engines, of which the following is a specification, referencebeing had therein tothe accompanying drawing.

In rotary pumps or engines hitherto used of the class, in which apluralityof pistons, movable axially in a rotary drum, are actuated byan oblique, rotatable disk there are some difficulties with regard tothe means causing the disk to partake in the rotary motion and as to thekeeping of the same in a central position during the said motion. Meanshitherto used are comparatively expensive and cause difficulties withregard to the space available. Thus, for instance, for keeping theoblique disk in its central position during its rotary motion a ballbearing provided at the periphery of the disk often is used. The saidconstruction, however, involves the disadvantage of a comparativelygreat rotary velocity being imparted to the balls and is unsuitable forpumps for water and impure liquids.

The object of this invention is to remove the said disadvantages inrotary pumps of the said class. In pumps, in which the drum and thepistons at opposite sides of the oblique disk are located symmetricallywith relation to one another, the said object is gained by arranging thepistons proper in such manner, that they cause the oblique disk torotate, the pump being then so arranged, that always two pistons atleast located diametrically or substantially diametrically oppositelywith relation to one another bear against abutments provided for theoblique disk at each piston and thus cause the disk to partake in therotary motion and also keep the same in a central position.

Figure 1 in the accompanying drawing shows a rotary pump arranged inaccordance with this invention and in a section on the line 0-p of Fig.2. Fig. 2 is a cross section on the line qr of Fig. 1. Fig. 3 is asection on a greater scale of the means connecting the piston with theoblique disk. Fig. 4 is an end view of the same.

The arrangement of the suction and delivery chambers of the pump andtheir coni Specification of Letters Patent.

Application filed September 12, 1917. Serial No. 191,052.

Romany PUMP 0R ENGINE.

nection with the suction and delivery pipes are not shown in the drawingas they form no part of this invention.

The drum 1, which is'divided transversely shaped disk 4 is provided, inwhich radial pins 5- are located extending inward toward the center ofthe disk 4. One pin5 is provided for each piston. The pins 5'extend intoopenings 6 provided in balls 7 respectlvely, fitted into two cup shapedpieces 8,9 located in cylindrical recesses '9 pro+ vided in the pistons.The said cup shaped Patented Mar. 18, 1919.

cal surfaces 11 of the cup shaped pieces 8, 9

v are adapted to transmit the pressure of the piston 3 in the rotarydirection of the drum to the pin 5 and the disk 4, so that the latter iscaused to partake in the rotary motion of the drum. 1. In Fig. 2 thecylindrical surfaces of the pieces 8, 9 coincide with the periphery ofthe ball. The cup shaped pieces 8, 9 fit into the recess 9 in suchmanner, that the end surfaces 10 of the said pieces bear closely againstthe end surfaces of the said recess as shown in Fig. 1, while there is aplay between the cylindrical surfaces 11 of the cup shaped pieces andthe cylindrical surface of the said recess 9*, as shown in Fig. 2. Thedisk 4 is kept in its oblique position by two forks 12, fixed to thecasing 13 of the pump, and by two rollers 14, rotating on pins fixed tothe said casing.

The described means for causing the oblique disk 4 to partake in therotary motion of the drum 1 operate in the following manner:

The angularity with which the disk 4 is arranged with respect to thelongitudinal axis of the drum 1 and shaft 2, causes the radial pitchline of each of the pistons 3 and their respective pins 5 to coincidewith one another when in the plane of the lines st and 0-;0. In allintermediate planes on the other and the radial pitch lines of the pinsand the pistons are displaced with relation to one another, the radialpitch lines of the pins being located nearer to the Plane st than thoseof the pistons. The said displacement is greatest in a plane forming anangle of 45 degrees to the plane st or in the planes 20- 0 and w-y. Bysuitably adapting the play between the cylindrical surfaces 11 of thecup shaped pieces 8, and the sides of the recesses 9 respectively, thesaid pieces 8, 9 :will' bear against the pistons 3 (at [the points m)located in one of the oblique planes, for instance the plane uu and inthe vicinity or the said plane, while in the other oblique plan wg andin the vicinity of the same there is a minimum play between the cupshaped pieces and the pistons (at n) at'the front side of the pistonswith relation to the rotary direction. Con.- sequently, during therotary motion of the drum the pistons will successively bearagainst thecup shaped pieces at the vicinity of the plane uo substantially as theteeth of a gear and, owing to the fact that always twoapistons, locatedsubstantially diametrically with relation to one another, actuate thedisk 4 and the minimumiplay between the pistons and the cup shapedpieces located in themot'her plane cc or in the vicinity of the sameprevents the disk from sliding, the disk is caused during the rotationto occupy a central position with relation to the other. rotating parts.The pistons must not necessarily bear against the surfaces 11 of the cupshaped pieces 8, 9 but may for instance bear against adjusting plates orscrew bolts fixed to the pistons.

Owing to the fact that the pants efiecting the connection between thepistons and the oblique disk are moved throughvery slightbination Witharotary drum, pistons movable longitudinally in said drum, vand anoblique dis-k surrounding the drum, of a joint between the said p stonsrespectively and the said disk, in which one part is 7 located in thepiston with a play transversely of the same.

2. In a rotary pump or engine the combination with a rotary drum,pistons movable longitudinally in said drum, and an oblique disksurrounding the drum, of radial pins connected with said disk, ballsprovided on the pins respectively, and cupshaped parts connecting theballs withthe pistons, a play being provided between the said cup-shapedparts and thepistons transversely of the latter.

In witness whereof, I have hereunto signed my name.

JDHAN ALBERT SVE'NS-SON.

Copies of thispatent may be obtained 1or five cents each, by addressingthe Commissioner of Patents.

Washington, D. 0.

